package com.lipl.base.javase.designpattern.singleton;

//双检锁/双重校验锁
public class Singleton {
    private volatile static Singleton singleton;  
    private Singleton (){}  
    public static Singleton getSingleton() {  
    if (singleton == null) {  
        synchronized (Singleton.class) {  
            if (singleton == null) {
                singleton = new Singleton();
            }
        }  
    }  
    return singleton;  
    }  
}